Notification not in a timely manner

I used this app for tracking USPS parcel and also checked update response of this app by using USPS website. I had to scroll an app window manually to get updates, and the notifications on the app were not refreshed in a timely manner without the same results shown in USPS website. This app should be more improved to show performance described in the app detail.

ぷちこ about Shipments - Package Tracker, v1.6.2